At present, research on the influence of asymmetric short-circuit current characteristics of a DFIG wind farm on the distance protection of the outgoing line of the farm and the related optimization strategy are mainly based on the action of crowbar protection. There are few studies on the influence of short-circuit current characteristics of RSC control on traditional distance protection after an asymmetric fault occurs. The short-circuit current characteristics of crowbar protection and RSC control under two operating conditions are analyzed, and the error expression of the fundamental frequency component extracted by discrete Fourier algorithm under these two operating conditions is analyzed. The influence of short-circuit current characteristics of the DFIG on traditional distance protection is analyzed. Time domain distance protection with transient resistance is not affected by short-circuit current characteristics of wind farms. Finally, a DFIG electromagnetic transient simulation model is established on the MATLAB/Simulink platform, and the operational characteristics of traditional distance protection and the time-domain distance protection under two operating conditions, including crowbar protection action and RSC control, are simulated and analyzed after single-phase grounding of the wind farm outgoing line through transition resistance. This work is supported by National Natural Science Foundation of China “Research on Strategy Setting, Risk Assessment, and Its Coordination Optimization of Coincide Time Sequence under Multi Perspectives” (No. 51367009).